function getSelectionCoords(win) {
win = win || window;
var doc = win.document;
var sel = doc.selection, range, rects, rect;
var x = 0, y = 0;
if (sel) {
if (sel.type != "Control") {
range = sel.createRange();
range.collapse(true);
x = range.boundingLeft;
y = range.boundingTop;
}
} else if (win.getSelection) {
sel = win.getSelection();
if (sel.rangeCount) {
range = sel.getRangeAt(0).cloneRange();
if (range.getClientRects) {
range.collapse(true);
rects = range.getClientRects();
if (rects.length > 0) {
rect = rects[0];
}
// 光标在行首时,rect为undefined
if(rect){
x = rect.left;
y = rect.top;
}
}
// Fall back to inserting a temporary element
if ((x == 0 && y == 0) || rect === undefined) {
var span = doc.createElement("span");
if (span.getClientRects) {
// Ensure span has dimensions and position by
// adding a zero-width space character
span.appendChild( doc.createTextNode("\u200b") );
range.insertNode(span);
rect = span.getClientRects()[0];
x = rect.left;
y = rect.top;
var spanParent = span.parentNode;
spanParent.removeChild(span);
// Glue any broken text nodes back together
spanParent.normalize();
}
}
}
}
return { x: x, y: y };
}
获取光标坐标位置
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